function toDecimal2(x) {   
  var f = parseFloat(x);   
  if (isNaN(f)) {   
      return false;   
  }   
  var f = Math.round(x*100)/100;   
  var s = f.toString();   
  var rs = s.indexOf('.');   
  if (rs < 0) {   
      rs = s.length;   
      s += '.';   
  }   
  while (s.length <= rs + 2) {   
      s += '0';   
  }   
  return s;   
} 

console.log(toDecimal2('213132.332132'));